Forget that given the show's current trajectory, Sherlock Seasons 4 & 5 probably won't air until 2016 and never, respectively — it's just somewhat comforting to know that Moffat and Gatiss (the latter known lovingly in the fandom as Godtiss) are still so passionate about Sherlock Holmes that they couldn't wait to plan seasons ahead:

Rather excitingly, Mark [Gatiss] and I [Steven Moffat], for no particular reason, we just got out of the rain and sat at the top of the [Sherlock] production bus … and we just started plotting out what we could do in the future. And we plotted out the whole of series four and five. The ideas we had that day, I thought were the best we’ve ever had.